MAINTENANCE
CHILLER-IOM-2004-E
45
2.
CLEANING THE CONDENSER
2.1.
Air cooled condensers
Clean the coils either with a vacuum cleaner, cold water, compressed air, or with a soft brush (non metallic). On units
installed in a corrosive atmosphere, coil cleaning should be part of the regular maintenance program. On this type of
installation, all dust gathered on the coils should be quickly removed by regular cleaning.
Caution: Except for NEOSYS range with microchannel coils, do not use high pressure cleaners that could cause
permanent damage to the aluminium coil fins.
2.2.
Plate heat exchanger condensers
Use a non-corrosive solvent to remove scale deposits. The equipment to be used for external water circulation, the quantity of solvent and
the safety measures to be taken must be approved by the company supplying the cleaning products or by the company conducting these
operations.
3.
COMPRESSORS / OIL DRAINAGE
Oil for refrigeration equipment is clear and transparent. It keeps its colour over a long period of operation.
Given that a correctly designed and installed refrigeration system will operate without any problems, there is no need to rep lace the
compressor oil even after a very long period of operation.
Oil that has become dark in colour has been exposed to impurities in the refrigeration piping system or to excessive temperatures on the
discharge side of the compressor, and this inevitably impairs the quality of the oil. Darkening of the colour of the oil or degradation of its
qualities can also be caused by the presence of humidity in the system. When the oil has changed colour or has been degraded, it must be
changed.
In this event, before putting the unit back into service, the compressor and the refrigeration circuit will have to be evacuated